Document Detail

Comparison of oestrous intensity between natural oestrus and oestrus induced with ovsynch based treatments in Japanese black cows.
MedLine Citation:
PMID:  19032430     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to examine the possible differences of oestrous intensity between natural oestrus and induced oestrus using the walking activity measuring device. Walking activity was used as an evaluation index of oestrous intensity. A total of 27 Japanese Black cows, more than 40 days after calving and clinically normal, were randomly assigned to three groups. Walking activity was recorded using a commercially available computerized pedometer system. The treatment groups consisted of an Ovsynch (n = 8) and a controlled internal drugs releasing device (CIDR) + Ovsynch (n = 9) group. The control group (n = 10) received no treatment. Walking activity was examined in all groups. Timed artificial insemination (timed AI) was performed at 16 hours after the onset of oestrus in the control group and at 24 h after second administration of GnRH in the treatment groups. Duration of oestrus had a tendency to be shorter in both the Ovsynch and the CIDR + Ovsynch groups when compared with the control group. The time required from the onset of oestrus to the time showing the highest number of steps of walking (the time to peak) showed a tendency to be shorter in CIDR + Ovsynch group. The number of steps of walking at peak and overall walking activities were significantly lower in both treatment groups than in the control group. Both activity and super-activity periods of time in the treatment groups were shorter than the control group. No difference was observed in the conception rate between the control (50.0%; 10/20), Ovsynch (50.0%; 4/8) and CIDR + Ovsynch groups (66.7%; 6/9). This study demonstrates that the oestrous intensity of cows in oestrus was different between natural oestrus and induced oestrus and also between the methods of the synchronization, but no difference was observed in the conception rate among the three groups.
Lu Meng Chao; S Sato; K Yoshida; Y Kawano; T Kojima; C Kubota
Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2008-11-20
Journal Detail:
Title:  Reproduction in domestic animals = Zuchthygiene     Volume:  45     ISSN:  1439-0531     ISO Abbreviation:  Reprod. Domest. Anim.     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-02-08     Completed Date:  2010-04-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9015668     Medline TA:  Reprod Domest Anim     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  168-70     Citation Subset:  IM    
The United Graduate School of Veterinary Sciences, Yamaguchi University, Yamaguchi, Japan.
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MeSH Terms
Behavior, Animal / physiology
Cattle / physiology*
Estrus / physiology*
Estrus Synchronization / methods,  physiology*
Gonadotropin-Releasing Hormone / administration & dosage
Insemination, Artificial / veterinary
Ovulation Induction / methods,  veterinary
Progesterone / blood
Reg. No./Substance:
33515-09-2/Gonadotropin-Releasing Hormone; 57-83-0/Progesterone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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